XCOM: Enemy Unknown is available now for pre-order on Steam and it includes a nifty Ni No Kuni-inspired reward system, based on how many people purchase it before launch.

Tier one gives purchasers the Elite Soldier Pack, which includes the classic XCOM soldier, soldier deco packs and complete color customization option. Tier two unlocks three XCOM-related items for Team Fortress 2: crafty hair, the Pyro as a Badlands alien and the Vigilant pin. Tier 3 is a free copy of Civilization 5.

XCOM: Enemy Unknown is $50 on Steam.

[Thanks, Ethan!]